Can we avoid overdevelopment of river floodplains by economic policies?: A case study of the Ouse catchment (Yorkshire) in the UK

River floodplains are significant environmental resources in that they provide multiple ecosystem services. However, river floodplains are/tend to be overdeveloped because indirect-use values linked with ecosystem services are overlooked by private landowners. In a case study of the Ouse catchment, it turns out that river floodplains tend to be overdeveloped in upstream areas because of a unidirectional spatial externality. We set a simple model that considers both direct- and indirect-use values to analyse the social optimisation. The essential point is that we must consider two types of environmental externalities related to the ecosystem services of river floodplains to make decisions on floodplain development. First, the development of river floodplains has opportunity costs in terms of lost ecosystem services. Second, the development of floodplains increases flood risks to people downstream (imposes a unidirectional spatial external costs). Theoretically, we can easily deal with the problem by zonal economic policies: zonal taxes or subsidies (price policies) and zonal marketable permits or transferable development rights (quantity policies). On the practical side, however, there are so many problems. Then, such approaches are too complex to use. First of all, we have to specify real complicated economic and physical systems which show non-linearity, irreversibility, site-specific relationships, and inter-dependency between systems and sites. Secondly such policies should be ‘zonal’, which might impose substantial transaction costs. In order to apply them to real situations, we have to determine the appropriate number of zones, their sizes and geographical shapes, and then set appropriate rates or amounts of permits in each zone. Furthermore, the determination of zones is difficult because of the trade-off between the internalisation of externalities and implementation costs of policies, which are also related to political frictions and market failure.     

Framing adaptive capacity through a history–futures lens: Lessons from the South East Queensland Climate Adaptation Research Initiative

This paper explores how the history–futures interface can inform a set of concrete adaptation options to climate change for stakeholders in South East Queensland, Australia. It is based on research undertaken as part of the Commonwealth funded South East Queensland Climate Adaptation Research Initiative (SEQ-CARI) that profiled 33 historical case studies to identify common themes in the ways societies responded to stress. The case studies are intended to provide a context for thinking about adaptive capacity with stakeholders in the four areas of human settlement and health; energy; agriculture, forestry and fisheries; and ecosystems and biodiversity. The case studies demonstrate that adaptive capacity varies with context and is affected by the complexity, technology, leadership, institutions and imaginative resources inherent to the social system examined. To increase the possibilities for reflection by stakeholders, the case studies were used to create a set of historical scenarios that explore some of the key features of human responses to challenges such as climate change. This paper draws on this work to suggest a set of ‘practical’ lessons for those engaged with climate change today and into the future.     

On the Pricing of Defaultable Bonds Using the Framework of Barrier Options

In the framework of the structural approach of bond pricing, we extend the Fujita–Ishizaka model by considering more realistic payoffs. The payoff to the bondholder at time of default, provided that default occurs prior to maturity, depends on the firm value at time of default. We also find the new measure with the advantage to calculate the value of bond and its financial interpretation. In addition, we present some numerical exmaples.     

Changes and continued stability in Japanese HRM systems: choice in the share economy

There is a growing acknowledgement by scholars both within and outside Japan that traditional patterns of human resource management are now under structural pressures to change. The author, from a labour economics perspective, examines the dimensional shifts that are now occurring in the Japanese labour market, both empirically and in the context of Weitzman's model of the share economy. She concludes that, in HRM terms, the current situation exhibits a combination of responses to change that are characterized by both innovative and traditional practices.     

Optimal public education policy in a two sector model

Proposing a simple two sector model with occupational choice, this paper analyzes the relationship between optimal public education policy and industrial structure. Workers are employed based on their skills and education policy influences the distribution of human capital. Thus, the industrial structure determines whether an elite education policy or an egalitarian education policy is desirable. In particular, this paper indicates how the productivities of each sector and market sizes affect optimal public education policy.     

A note on the condition of no unbounded profit with bounded risk

As a corollary to Delbaen and Schachermayer’s fundamental theorem of asset pricing (Delbaen in Math. Ann. 300:463–520, 1994; Stoch. Stoch. Rep. 53:213–226, 1995; Math. Ann. 312:215–250, 1998), we prove, in a general finite-dimensional semimartingale setting, that the no unbounded profit with bounded risk (NUPBR) condition is equivalent to the existence of a strict sigma-martingale density. This generalizes the continuous-path result of Choulli and Stricker (Séminaire de Probabilités XXX, pp. 12–23, 1996) to the càdlàg case and extends the recent one-dimensional result of Kardaras (Finance and Stochastics 16:651–667, 2012) to the multidimensional case. It also refines partially the second main result of Karatzas and Kardaras (Finance Stoch. 11:447–493, 2007) concerning the existence of an equivalent supermartingale deflator. The proof uses the technique of numéraire change.